The TAPP Green Gas Drum is a 400-round green gas drum (AW Custom) for your KWA/KSC HK45 & USP that bolts on with no HPA setup.
Spec card
| Type | Green Gas Drum |
|---|---|
| Feeds from | Green gas (GBB) drum |
| BB capacity | 400 |
| Overall profile | Large |
| Recommended mags | AW Custom |
| Best for | Plug and play, no HPA setup needed |
Color options
- Black: 400-round AW Custom green gas drum in black
- Red: 400-round AW Custom green gas drum in red
- Green: 400-round AW Custom green gas drum in green
- Green/Black: 400-round AW Custom green gas drum in green/black
- AW Adapter Only: adapter only, for an AW green gas drum you already own
Compatibility
| Brand / Platform | Compatibility Verification | Tuning & Adjustment Notes |
|---|---|---|
| KWA / KSC HK45 & USP GBB Pistol Series | Direct Native Fit | Direct OEM factory standard for KWA / KSC HK45, HK45 Tactical, and USP series (Full Size, Match) utilizing the System7 / NS2 engine. Fine-tune the adjustable gasket height to establish an airtight compression seal against the loading nozzle seal, ensuring maximum gas efficiency and smooth recoil recovery without creating drag on the returning slide assembly. |
| KWA / KSC USP Compact | Verified Fit | This full-size adapter also seats and seals correctly in the USP Compact's magwell. Fine-tune the adjustable gasket height for the shorter compact slide travel. |
| Tokyo Marui / Umarex VFC / WE-Tech HK45 & USP Pistol Lines | NOT Compatible | Third-party HK45 and USP platforms (Tokyo Marui, VFC, WE-Tech) and non-System7 KWA pistol series utilize distinct internal magwell channel dimensions, non-matching valve striker placement, and proprietary gas router seal profiles incompatible with KWA System7 NS2 architecture. |
Have a USP Compact and only want the compact-specific listing? See the KWA USP Compact HPA Adapter/Drum — note that adapter is sized for Compact only and won't fit the full-size HK45/USP/USP Match.
What's in the box and how to install
- Plug and play: no pulling valves or feed lips from stock mags.
- Materials: standard body is Nylon PA12. Carbon Fiber is available (3x stiffness, up to 38% higher tensile strength than Nylon 12).
- Made in the USA by TAPP Airsoft.
- Install: insert with the bolt or slide locked back.
- Warranty: 30-Day Warranty + Lifetime Support.
More options
Also available for: KWA USP Compact
Want to compare every option? Use the KWA/KSC HK45 & USP Adapter Builder.
